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1.�I(y��)Σ��

һ��r��,��偠t��70��80dB(A)��й��L(f��ng)�C(j��),��L(f��ng)�C(j��),��ˮ�Þ��Ҫ��Դ��ķ�ֵ��ڵ��l,��S��(qi��ng)��(d��ng),��Ŀǰ��F(xi��n)��偠t��,��͡�ʯ�X�ͻ��Ȼ��,��ú��,��Һ��ʯ�͚��ȼ�ϣ��˕r(sh��)��a(ch��n)��Ҫ��偠t��ȼ��F��cȼ��^(gu��)��a(ch��n)��,��β��L(f��ng)�C(j��),��ˮ��

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b.ᘌ�(du��)ȼú偠t�ĸ��ʩ��һ��ڸ��_(k��i)3��(g��)��ڣ�2̎�M(j��n)�L(f��ng)1̎��L(f��ng),��԰��b��(��g�ӵ��Ƭ��ÈA��ֱ��ʽ),��ɽ��200dB(A)��ϡ�

c.��,��,��ʯ�X�ͻ��Ȼ�⡢ú��,��Һ��ʯ�͚��ȼ�ϵ�偠t��ȼ��F��^(gu��)��ԙC(j��)е��-�՚��≺��,��ȼ��^(gu��)��п��ƽo��x�õ͉��,��t�Ł�(l��i)��,��

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